Reversing mechanism for regenerative reversing-furnaces.



Patented May 12,1914.

'3 sums-SHEET 1.

.i 'UNITED srA'rEs PATENT oEEioE.

WILLIAM CHAS. ROE, Fl PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO KNOX PRESSED d'5 'WELDED STEEL COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

Specication of Letters Patent.

Patented May 1 2, 191 4.

Application led April 19,` 1913. Serial No. 762,232.

. .To all 'whom 't may concern.'

Be it known that I, WILLIAM C. Ros, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Reversing Mechanism for Regenerative Reversin -Furnaces, of which the following is a fully, clear, and exact description, reference being had to the accompanying drawings, forming vpart of this specification, in which:-

` mechanism for regenerative reversing fur- Races, and is designed to Aprovide means of simple, convenient and ellicient character,

whereby the variousoperations of the gas and air valves necessary to com letel reverse a furnace of this type can e e ected by the operation of a single motor.

The nature of my invention will be best nnderstood by vreference to the accompanymg drawings, in which I have shown the that for the right hand x nated -8, and the one for t e left hand port preferred embodiment thereof and which will now be described, it being premised,

however, that various changes may be made in the details of construction and arrangementof the several parts, without departing from the spirit and scope of my invention as defined inthe appended claims.

In these drawings, the numerals I2 und 3 designate right and left hand gas ports leading from a valve chamber 4 to the furnace regenerators, not shown.

5 is the gas admission ort, and 6 and 7 are 'the two air ports leading t the regenerators. Each of thesejports isprovded with a vertically movable air inlet valve,

ort being desigbeing shown at 9. r

10 is .a port leading lto the stack and communicating with the Iports 6 and 7.

11 is a port leading from the gas-reversing valve chamber 4 to the stack.

The numeral 12 designates a vertically lmovable damper which is placed between the valve 9 and the point of communication of theV port 6 with the port 10. 13 is a similar damper which is placed between the valve 8 and the point of communication between the ports 7 and 10.

14 designates va gas-reversing valve, and 15 a cruciform shaped seat therefor located in the `chamber 4. The valve 14 is of the type whiph, in order to be operated, is iirstlifted out of a bottom bearing, such as shown at 15, through an angle of approximately ninety degrees.

In the position ofthe ports shown in Figs. 1 and 2, gas enters the port 5 and passes through one side of the chamber 4 into the through the opposite side of the chamber 4 to the stack port 11. The valve 8 being open, damper 13 being closed, damper 12 eing open, and valve 9 being closed, air

the return being by wayof port 6 into the stack through port 10, which is at a lower level than the gas port 5l and stack connection 11.

The flue, valve and damper arrangement just described forms no part of my invention, which is concerned with operating mechanism for the valves 8, 9 and 14 and the dampers 12 and 13. This operating mechanism will now be describe The numeral 16 designates a double-act ing powercylinder whose piston or plunger rod 17 is detachably connected at 18 with one end portion of a reciprocable rack bar the teeth of a pinion 20, mounted Ion the transverse shaft 21, to which is also secured nient with the teeth of the pinion 20 by any suitable means, roller 23.

24 is a vertical extension of the shaft of the'gas-reversing valve 14. Secured to this extension is a pulley 25. 26de a crank arm alsofscured to .the shaft extension 24.` This 'crank arm is'of alligator-j aw form, the two jaws being designated 26a and 26h and being adapted to be engagedby an antifriction roller/27 on the rack bar 19. Also secured to thetransverse shaft 21 is a cam having a Fig. 2, and is then rotated left hand regenerator port 3. The returnf from 'the furnace is through the port 2 and will enter theport-7 through the vvalve 8,

19. The teeth of this rack bar mesh with a pulley 22. The rack 19 is held in engagesuch as the top bearing low portion 28 and a high portion 29. This cam is arranged to act upon an antifriction roller 30, mounted on one arm of a lever 31- fulcrumed at 32. The other arm of this lever is forked, as shown at 33, and engages the iiangefl of a litingsleeve 35, loosely y rope or cable 37 is carried over a similarpulley.39, and thence downwardly to the vair inlet valve 9. A second rope or cable 40 is passed around the pulley 22 on the shaft 21, with one end portion passing. over suit-able yidlers 41, Vand thence downwardly to the A .damper 13, to which it is connected, ,the

other end portion of the rope or cable 40 passingover similar pulleys 42, andbeing connected to the vertically Vmovable damper 12.-

Theoperatio'n is as follows :Assuming the parts to be in the position shown in Figs. 8, 4: and 5, the motive cylinder 15 is operated to orce'its-rod or plunger 16 to the right.

I Thiseilects the rotation of the shaft 2l and thereby of the pulley 22. The rotation of i y the pulley 22 operates the rope or cable 41,

thereby closing the damper 12 and opening the damper 13. During this first period of rotation of the shaft 21, the/cam on said shaft has been rotated to bring its high portion 21 onto the roller 30,01%' the lever 31. This actnates said lever v'to lift the shaft 24 and thereby the valve/14. During this time, the roller`27 on thev rack bar 19 Ahas been moving idly on the face of the 'aw 26a of the of the valve bar this roller 27 crank 26. When, however, t e valve has been raised in the manner described (which occurs during 'the rst quarter of the stroke asses into the recessed ang 'between the inner faces of the Atwo jaws and into'engaging contact With the face yof the jaw 26", .and during the middle portion of the stroke, the shaft ex-I tension 24 on the valve is turned through an angle of approximately ninety degrees. During thislast eriod of movement, the hi h 4portion 29 oiJ the cam remains on the ro er 30, holding the valve-llll in .itsv raised position While it is being turned. Duringv the last quarter of thel'stroke, the` low portion of the cam 29 comes on the roller 30 and thus effects the lowering of the valve 14. It will be noted that the rollerv 2 7 acts effectively a's a stop at all times to prevent movement of the valve 14, except during its r eversal by the action of the cyl 'luder 16. The

te rotation of the shaft 24 through the ypulley I 25 act;`v to close the air valve 8 and open the air valve 9T' y 1t will bfereapparent that a single stroke of the motor edects allthe opera-tions necessary to ,make the complete reversal of the furu nace. The parts remain in the which they are left at the close o the operations just described until it' is desired to again Vreverse the furnace. The cylinder 16 is then operated lin the reverse direction.

rllhis repeats the cycle of operations, but in,

the reverse manner.

positions iny The mechanism is extremely simple in its construction and arrangement; is not likely Y et out of order, or if it does, can be rea ily repaired; and enables the furnace attendant',- by the operation of a single valve controlling the motive cylinder 16, to reverse the furnace at-Will.

I claimtv 1. The combination of a gas-reversing valve arranged to be lifted and then rotated,

two air valves arranged to -be .simultanea ously operated in `opposite directions and damper-s also arranged to be reversely operated, of asi'ngle motive device, connections actuated by said device for operating said valve and dainpers, lifting means also oper ated by said device for first raising the valve, and other means also operated by said device for subsequently rotating the valve, substantiallyas described. A

2. The combination with a gas-reversing valve mounted to be lifted, then rotated, and

then dropped back to its Seat, `and With two dampers and two air valves of which one damper and one air valve are to be opened simultaneously with the closing of the other damper and air valve, of a single motive device, connections operated by vsaid devicel for rst raising the reversing valve and then rotatingit, andiconnections operated by the rotation'of the said Vvalve for simultaneously closing one air valve and openinvthe other, and other connections operated by the mo.-

tive device for simultaneously opening one damper and closing the other, substantially as described.

.3, ,The combination with a gas-reversing valve, mounted for both vertical and rotary movement, of a motor, a shaft having a pinpinion and connected to be reciprocated by the motor, a liftinv. lever for the valve, vmeans onsaid shaft leer actuating the lifting ion therein, a horizontal rack engaging the lever, av crank member connected to the L valve, and means'o erated by the motor for engaging and act ating the crank member after the lvalve has been raised by the liftingf lever, substantially as described;

4. The combination with a gasreversingy valve arranged to be first lifted andl then" lftinv mechas.

rotated, of a motive cylinder g nism for the valve 'connected to sald eylin.; der, and a valve-rotating device arranged to be operated by the cylinder after the valve has been lifted, together with oppositely movable air valves, and connections between said valve and the motive device, substantially as described,

5. The combination with a gas-reversing valve arranged to be first lifted and then rotated, of a motive cylinder, lifting mechanism for the valve connected to said cylinder, and a valve-rotating device arranged to be operated by the cylinder after the valve has been lifted, to ether with oppositely 1 movable dampers an operating connections between the dampers and the motive device, substantially as described.

t5. The combination with a rotary gasreversing valve, of a bifurcated crank member connected to the valve, a motive cylin-4 der, and a reciprocating member operated by said cylinder and arranged to alternately engage the two arms of Said crank member, substantially as described.

7. The combination with a vertically movable and rotatable reversing valve, of a double-acting cylinder, valve-lifting mechanism arranged to be first actuated by the cylinder, and a bifnrcated valve-rotating device connected to the shaft of the valve and arranged to be operated by thc cylinder after the valve has been lifted, si-lbstantially as described.

8. The combination with a vertically movable and rotatable reversing valve, of a motive device, a reciprocating member actuated bv said device` -a shaft arranfcd to be rotatcd by the reciprocating member, cam-andlever valve-lifting mechanism actuated by said shaft. and a crank member attached to the `valve shaft and arranged to be operatively engaged by the reci|n'ocating member after the valvc has been lifted. said crank member being normallyr dsconnectedfrom the reciprocating member and arranged to be operated by moving contact therewith; substantially as described.

9'. The combination with a vertically movable and rotatable reversing valve, of a double-acting cylinder, a reciprocating rackbar connected to the piston of the cylinder, a shaft arran ed to be rotated by the rack bar, cam-andever valve-lifting mechanism actuated by the rotary shaft, a crank member attached to the valve shaft, and a'lso ar"` ranged to be engaged-by the rack bar after the valve has been lifted, a pulley on the valve shaft, a flexible member passed around the pulley, and two'oppositely movable valve members connected to opposlte end portions .of the exible member, substantially as described.

1 0. The combination with a vertically movable and rotatable reversing valve, of a double-acting cylinder, a reciprocating rack bar connected to the piston of the cylinder, a shaft arranged to be rotated by the rack bar` cam-and-lever valve-lifting mechanism actuated by the rotary shaft, a crank member attached to the valve shaft, and also arranged to be engaged bythe rack bar after the valve has been lifted, a pulley on said rotary shaft, a flexible member passed around the said pulley, and two oppositely acting dampers connected to opposite end portions of the flexible member, substantially as described.

In testimony whereof, I have hereunto set my hand.

WM. cHAs. ROE.

Witnesses:

Il, M. ConwiN,

lso. II. Paimrmmc. 

